Segmented Pyrotechnic Safety Device Screen
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Solution Overview
Problem
Existing firing safety devices for pyrotechnic devices are bulky and heavy, with springs losing mechanical reliability over time and electric motors being inefficient and difficult to integrate, while existing solutions do not effectively reduce device size or mass while maintaining reliability.
Innovation Solution
A firing safety device with radially moving screen elements, utilizing shape-matching profiles and micro-machined or micro-engraved parts, allowing for reduced stroke and size through segmented screen design and MEMS technology, enabling efficient and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional springs or electric motors are used to move the screen, then the screen can be moved from safety to armed position, but the device becomes bulky, heavy, and unreliable over time
Solution Approach 1:
The screen is divided into multiple segments that can move independently relative to each other. Each segment can be positioned to either block or allow passage of the pyrotechnic effect, eliminating the need for a single large motor while achieving the same safety function with reduced mass and improved reliability.
Solution Approach 2:
The screen segments are designed with dynamic positioning capability, allowing them to move between safety and armed positions. This dynamic configuration enables the system to achieve reliable pyrotechnic chain interruption without requiring oversized static components or powerful motors.
2Reliability
If the screen is made massive to ensure interruption of the pyrotechnic chain, then reliability is improved, but device size and mass increase
Solution Approach 1:
Instead of using a single massive screen, the invention employs multiple smaller screen segments. These segments collectively provide reliable pyrotechnic chain interruption through their combined positioning, allowing the device to maintain safety functionality while significantly reducing overall size and mass.
Solution Approach 2:
Multiple screen segments work together in combination to achieve the pyrotechnic chain interruption function. By merging the blocking capability of several smaller segments, the system achieves the same reliability as a single large screen but with reduced dimensions.
3Reliability
If powerful motor means are used to move the screen, then the screen can be actuated reliably, but the device becomes more complex and requires more energy
Solution Approach 1:
The actuation system is segmented into multiple independent actuators, each controlling a screen segment. This segmentation allows for simpler, less powerful individual actuators compared to a single powerful motor, reducing overall device complexity while maintaining reliable screen actuation.
Solution Approach 2:
Instead of using a single motor with excessive power to move the entire screen, the system applies partial action through multiple smaller actuators that each move individual segments. This approach reduces the power requirement for each actuator and simplifies the overall motor means while achieving complete screen actuation.
Data Source
Figure 1
Figure 2~3b
Figure 4a~5
AI summary
A safety device for igniting a pyrotechnic device, comprising a channel (7) between an igniter (6) and a pyrotechnic charge (5, 5a), comprises a screen consisting of several elements (8a, 8b) that can be moved relative to each other by motors (11) between a safety position in which the channel is blocked and an armed position in which the channel is unblocked. None of the screen elements can block the channel on its own.